mosemiller



Jan. 21, 1964 R. 1.. MOSEMILLER INKER 2 Sheets-Sheet 1 Filed June 22,1962 INVENTOR Robert L. Mosemiiler A; t fi m W;

R. L. MOSEMILLER Jan. 21, 1964 INKER 2 Sheets-Sheet 2 Filled June 22,1962 INVENTOR Robert L. Mosemiller United States Patent 3,li,3?3Patented Jan. 21, 1964 ice 3,118,373 INKER Robert L. Mosemiller,Wilkinsburg, Pa., assignor to Miller Printing Machinery Co., Pittsburgh,Pa., a corporation or" Pennsylvania Filed June 22, 1962, Ser. No.204,427 6 Claims. ill. 101-348) This invention relates to an inker for aprinting press and is concerned particularly with improved means forvarying the amplitude of vibration of vibrator rollers of the inker.

As is well known to those skilled in the printing art, an inker fordelivering ink to a form generally includes one or more vibrator rollerswhich are rollers which vibrate or oscillate axially while they areturning whereby to distribute and work up the ink. For reasons wellknown to those skilled in the art it may be desired to vary or alter theamplitude of vibration of vibrator rollers.

The mechanisms heretofore provided'for varying the amplitude ofvibration of vibrator rollers have had various disadvantages. In manycases it has been necessary to stop the press to adjust or operate themeans for varying the amplitude of vibration of the vibrator rollers. Inother cases the mechanism for varying the amplitude of vibration of thevibrator rollers has been complex and costly and unreliable inoperation, necessitating considerable maintenance work resulting inundesirable down time for the press.

I provide an inker comprising means for varying the amplitude ofvibration of vibrator rollers in the inker which may be operated to varythe amplitude of vibration of the vibrator rollers from zero (novibration) to a maximum without stopping the press and which arecomparatively simple and reliable in operation. My inker comprises adriven rotary member, a crank pin Whose axis is parallel to and normallyoifset from the axis of the driven rotary member carried by the drivenrotary member and rotatably therewith as a unit, means separate from thedriven rotary member operable while the driven rotary member is rotatingfor altering at will the distance which the axis of the crank pin isoffset from the axis of the driven rotary member, a vibrator roller,means for rotating the vibrator roller and connections including aconnecting rod between the crank pin and the vibrator roller for axiallyvibrating the vibrator roller, the greater the distance which the axisof the crank pin is offset from the axis of the driven rotary member thegreater is the amplitude of vibration of the vibrator roller. Althoughthe axis of the crank pin is normally offset from the axis of the drivenrotary men.- ber it may in certain cases if desired be disposed inalignment with the axis of the driven rotary member resulting in absenceof vibration of the roller which is normally a vibrator roller.

I provide mounting means for the crank pin carried by the driven rotarymember and shiftable to alter the distance which the axis of the crankpin is offset from the axis of the driven rotary member together withmeans operable while the driven rotary member is rotating for shiftingthe mounting means. I desirably employ linkage carried by the drivenrotary member on which the crank pin is mounted, the linkage beingshiftable to alter the distance which the axis of the crank pin is oh"-set from the axis of the driven rotary member, together with meansadjustably positionable generally axially of the driven rotary memberfor thus shifting the linkage. The mounting means may includeparallelogram linkage which is shiftable to alter the distance which theaxis of the crank pin is offset from the axis of the driven rotarymember while maintaining the axis of the crank pin parallel to the axisof the driven rotary member.

In my inker alteration of the distance which the axis of the crank pinis oliset from the axis of the driven rotary member may be accompaniedby slight axial movement of the crank pin, and the connections with thevibrator roller preferably comprise a connecting rod with sphericalbearings at both ends to compensate for the axial component of themovement of the crank pin.

More specifically my inker may comprise a driven rotary member, a crankpin whose axis is parallel to and normally offset from the axis of thedriven rotary member, mounting means for the crank pin carried by thedriven rotary member and shiftable to alter the distance which the axisof the crank pin is offset from the axis of the driven rotary member, athreaded adjusting member, means with which the threaded adjustingmember is in threaded interengagement so that when the threadedadjusting member is turned relatively thereto the threaded adjustingmember moves in a direction generally parallel to the axis of the drivenrotary member, means connecting the threaded adjusting member with themounting means for shifting the mounting means to alter the distancewhich the axis of the crank pin is offset from the axis of the drivenrotary member upon such movement of the threaded adjusting member, avibrator roller, means for rotating the vibrator roller and connectionsincluding a connecting rod between the crank pin and the vibrator rollerfor axially vibrating the vibrator roller, the greater the distancewhich the axis of the crank pin is offset from the axis of the drivenrotary member the greater is the amplitude of vibration of the vibratorroller.

The threaded adjusting member may be coaxial with the driven rotarymember and means may be provided with which the threaded adjustingmember is in threaded engagement so that when the threaded adjustingmember is turned relatively thereto the threaded adjusting member movesgenerally axially of the driven rotary member. A member is preferablyprovided connecting the threaded adjusting member with the mountingmeans for shifting the mounting means to alter the distance which theaxis of the crank pin is offset from the axis of the driven rotarymember upon such generally axial movement of the threaded adjustingmember, said member being coaxial with the driven rotary member andbeing rotatably mounted with respect to both the threaded adjustingmember and the driven rotary member.

My inker comprises a frame, and I may provide a bushing stationarilymounted in the frame together with a driven rotary member mounted forrotation in the bushing, a crank pin whose axis is parallel to andnormally offset from the axis of the driven rotary member, mountingmeans for the crank pin carried by the driven rotary member andshiftable to alter the distance which the axis of the crank pin isoffset from the axis of the driven rotary member, an adjusting collarthreadedly connected with the bushing so that when the collar is turnedrelatively to the bushing the collar moves generally axially thereof andmeans connecting the collar with the mounting means for shifting themounting means to alter the distance Which the axis of the crank pin isoffset from the axis of the driven rotary member upon such movement ofthe collar.

In a preferred form of structure my inker includes a bell crank leverpivoted to the driven rotary member about an axis offset from the axisof the driven rotary member and substantially normal to a planecontaining the axis of the driven rotary member, the bell crank leverhaving a first arm intersecting the axis of the driven rotary member anda second arm extending generally parallel to the axis of the drivenrotary member, a first link pivoted to the second arm and extendinggenerally at right angles to the axis of the driven rotary member, asecond link pivoted to the first link and to the driven rotary memberinsuring maintenance of the first link extending generally at rightangles to the axis of the driven rotary member in all operativepositions of the bell crank lever, a crank pin carried by the first linkwhose axis is parallel to and normally ofl'set from the axis of thedriven rotary member and means separate from the driven rotary memberfor altering at will the angular position of the bell crank lever andthereby altering the distance which the axis of the crank pin is oil etfrom the axis of the driven rotary member.

The driven rotary member may have an axial bore extending through abushing stationarily mounted in the inkor frame and mounting means maybe provided for the crank pin which are carried by the driven rotarymember at the portion thereof disposed outwardly of the bushing andshiftable to alter the distance which the axis of the crank pin isoffset from the axis of the driven rotary member. An adjusting collarmay be threadedly connected with the inner end of the bushing so thatwhen the collar is turned relatively to the bushing the collar movesgenerally axially thereof. A connecting member may extend through thebore of the driven rotary member and connect the collar with themounting means for shifting the mounting means to alter the distancewhich the axis of the crank pin is offset from the axis of the drivenrotary member upon such movement of the collar.

In an inker employing a bell crank lever construction as above referredto I may provide means separate from the driven rotary member guided formovement generally along the axis of the driven rotary member and havinga sliding connection with the first arm of the bell crank lever forturning the bell crank lever about its pivotal connection with thedriven rotary member and thereby altering the distance which the axis ofthe crank pin is offset from the axis of the driven rotary member.

Other details, objects and advantages of the invention will becomeapparent as the following description of a present preferred embodimentthereof proceeds.

In the accompanying drawings I have shown a present preferred embodimentof the invention in which FIGURE 1 is an axial cross-sectional view ofthe means for varying or adjusting the amplitude of vibration of thevibrator rollers of the inker;

FIGURE 2 is an elevational view with a portion cut away showing themeans for varying the amplitude of vibration of the vibrator rollers asviewed from the left in FIGURE 1 but with the elements in a differentoperative position than that shown in FIGURE 1 and also showing theconnections from such means to the vibrator rollers whereby the vibratorrollers are vibrated;

FIGURE 3 is a view of the mechanism shown in FIG- URE 2 taken along theline ill-Ill of FIGURE 2 showing the inkcr frame in cross section andthe remainder of the structure in elevation, and

FIGURE 3a is a view forming a continuation of FIG- URE 3 to the right ofFIGURE 3 showing the ends of the vibrator rollers opposite the ends ofsuch rollers shown in FIGURE 3 and the means for rotating the vibratorrollers.

Referring now more particularly to the drawings, the inlzcr and thepress to which the inker is applied may be of conventional constructionexcept for the means for varying the amplitude of vibration of thevibrator rollers of the inlter. I therefore show in the drawings only somuch of the structure as is necessary to enable those skilled in the artto understand my invention.

The inker may comprise any desired number of vibrator rollersincorporated with other rollers to cooperatively distribute and work upthe ink and apply it to the form as well known to those skilled in theart. For purposes of explanation and illustration 1 show in the drawingstwo vibrator rollers designated. respectively by reference numerals 2and 3, those rollers being disposed at one side of the inker. Twosimilar vibrator rollers will be disposed in the opposite side of theinlzer but since they will be substantial duplicates of the vibratorrollers 2 and 3 and operated and controlled with respect to theamplitude of their vibratory movement similarly to the vibrator rollers2 and 3 they are not shown.

The vibrator rollers 2 and 3 have shafts 2a and 31: respectively mountedin suitable bearings 21) and 3b repeclively as well known to thoseskilled in the art permitting axial vibration thereof at the same timeas the rollers are rotated. The means for driving the vibrator rollers,i.e., rotating them about their axes, may be conventional. A drivingshaft 47 may be driven by any suitable source of power, for examplethrough a pulley or gear 48 fixed thereto. Also fixed to the drivingshaft 47 may be a driving gear 49 which may mesh with a wide faced idlerpinion Stl rotatably mounted on a stub shaft 51. Another wide facedidler pinion 52 is rotatably mounted on a stub shaft 53. The shaft 2a ofthe vibrator roller 2 is slidably mounted in a bearing 20 in line withthe bearing 2b. Similarly the shaft 3a of the vibrator roller 3 isslidably mounted in a bearing 3c in line with the bearing 3b. Thebearings 2b and 3b are mounted in one side frame member 12 of the inlzerand the bearings 20 and 3c are mounted in the opposite side frame member12a of the inker. A gear 54 for rotating the vibrator roller 2 is fixedto the shaft 2a and meshes with the wide faced idler pinion 52 and agear 55 for rotating the vibrator roller 3 is fixed to the shaft 3a andmeshes with the wide faced idler pinions 50 and 52. Through the gearingshown the vibrator rollers 2 and 3 are rotated continuously whilevibrating axially since the gears 54 and 55 are in continuous mesh withthe wide faced idler pinions 50 and 52 in all axial positions of thevibrator rollers 2 and 3.

Each vibrator roller is provided with spaced collars 4 between which isdisposed a roller 5 carried by one of the two cross arms 6 of athree-armed lever 7. The lever 7 is mounted in suitable hearings in theframe for turning movement about the axis 8, turning movement of thelever 7 being effected by reciprocation of a connecting rod 9 pivoted toa third arm 10 of the lever 7 at 11. As the connecting rod 9reciprocates it oscillates the lever 7 about the axis 8 and such leverthrough the rollers 5 oscillates or vibrates the vibrator rollers 2 and3. The two vibrator rollers at the opposite side of the inker which arenot shown in the drawings may be similarly oscillated or vibrated by aconnecting rod 9' disposed generally beside and functioning analogouslyto the connecting rod 9 and operatively connected with the vibratorrollers at the opposite side of the inker by means such as the meansshown in the drawings connecting the connecting rod 9 with the vibratorrollers 2 and 3.

One of the side frame members of the inker is shown at 12. Stationarilymounted in a bore 13 of the frame member 12 is a flanged bushing 14 theflange 15 of which is disposed outside the frame member 12. The bushinghas a projecting portion 16 which projects inwardly from the inner faceof the frame member 12 as shown in FIGURE 1. The bushing 14 is rigidlyfastened to the frame member 12 by bolts 17.

Journaled within the bushing 14 is a driven rotary member 18 havingintegral therewith a gear 19 disposed outside the frame member 12through which the rotary member 18 is driven from the press drive bysuitable gearing not shown. The driven rotary member 13 has a mountingportion 20 disposed outwardly of the inlt'er frame to which is pivotedat 21 a bell crank lever 22 having a first arm 23 extending transverselyof the axis of the driven rotary member 18 and a second arm 24 extendinggenerally parallel to the axis of the driven rotary member 18. A firstlink 25 is pivoted to the second arm 24 at 26 and extends generallytransversely of the axis of the driven rotary member 18. A second arm 27is pivoted to the arm 25 at 28 and to the mounting portion 2t) at 29.The mounting portion 2%, the arm 24 and the links 25 and 27 constitute aparallelogram mounting whereby the link 25 is maintained at all timessubstantially perpendicular to the axis of the driven rotary member 18.

A crank pin 30 is carried by the link 25 and has its axis parallel tothe axis of the driven rotary member 18 but normally offset therefrom.The crank pin 39 is provided with two spherical bearings 31 and 31'received in spherical bearing portions 32 and 32' respectively at theupper ends of the respective connecting rods 9 and 9. The lower ends ofthe connecting rods 9 and 9 are similarly connected by sphericalbearings with the respective three-armed levers for vibrating thevibrator rollers. The purpose of providing the spherical bearings is toallow for a slight change in angularity of the connecting rods when theparallelogram mounting for the crank pin 30 is shifted to alter thedistance which the axis of the crank pin is offset from the axis of thedriven rotary member 13 as will presently be described. Such shiftingmovement of the crank pin 3% has a small axial component.

The arm 23 of the bell crank lever 22 is bifurcated and the spacebetween the opposed portions thereof is bridged by a pin 33 which passesthrough a block 34 which consequently is pivotally mounted to the arm23, the block 34 extending generally upwardly from its pivotal mounting33. The block 34 has therethrough an opening 35 through which passes thereduced end 35 of a connecting member 37 which as shown is in the formof a rod with both ends reduced. At the end 36 the connecting member 37has spaced plates or flanges 38 disposed at opposite faces of the block34, the assembly being maintained by a nut 39 threaded onto the end ofthe connecting member 37. Thus the connecting member 37 is connectedthrough the block 34 with the arm 23 but the opening 35 is of suificientextent in the plane of FIGURE 1 to allow relative shifting between theconnecting member 37 and the block 34 as the angularity of the bellcrank lever 22 changes.

The connecting member 37 has a sliding fit in an axial bore 40 in thedriven rotary mem er 18 and is adapted for adjusting movement in theaxial direction by means presently to be described. Since the connectingmember 37 is maintained against transverse movement by its lit withinthe bore 4% the block 34 will move up and down relatively thereto uponangular movement of the bell crank lever 22. Also a bushing 41 isprovided about the reduced portion 36 of the connecting member 37providing for relative turning of the block 34 and the connecting member37, it being borne in mind that the driven rotary member 18 carries themounting portion 29 on which the linkage carrying the crank pin 30 is inturn mounted. As will presently appear the driven rotary member 18 turnsabout the axis of the bushing 14 in operation and the connecting member37 is free for turning movement relatively to the driven rotary member.

The inwardly projecting portion 16 of the bushing 14 is externallythreaded at 42 and an internally threaded collar 43 is threadecllyengaged therewith so that upon turning of the collar it moves axially ofthe bushing 14. The collar 43 is open at its left-hand end viewing FIG-URE 1 but at its right-hand end is provided with a bearing 44 in which areduced end 45 of the connecting member 37 is rotatably mounted andmaintained against axial movement relatively to the collar 43. A locknut 46 is provided for maintaining the collar 43 in desired adjustedpositions axially of the bushing 14.

In operation the driven rotary member 18 is rotated through its gear 19as above described. Rotation of the driven rotary member 13 isaccompanied by rotation of the mounting portion 26 which is operativelyintegral With the driven rotary member 18. The parallelogram linkage ormounting means for the crank pin 31 likewise rotates with the drivenrotary member 18 since it is carried by the mounting portion 20. Thecrank pin 30 is as above stated normally offset from or eccentric withrespect to the axis of the driven rotary member 18 and reciprocates theconnecting rods 9 and 9 which impart vibratory or axial oscillatorymotion to the vibrator rollers.

When it is desired to alter the amplitude of vibration of the vibratorrollers the lock nut 46 is loosened and the collar 43 is turned, causingit to move axially of the bushing 14. This causes through the connectingmember 37 turning of the bell crank lever 22 about the axis of itspivotal connection 21 with the mounting portion 2% which is accompaniedby alteration of the offset or distance between the axis of the crankpin 31 and the axis of the driven rotary member 18. If the collar 43 ismoved toward the left viewing FIGURE 1 the offset of the crank pin 3%relatively to the axis of the driven rotary member 18 is increased whileif the collar 43 is moved toward the right such ofiset is decreased. Theconnecting member 37 is mounted so that it is free to rotate both withrespect to the block 34 and with respect to the collar 43 and it isprobable that in operation there will be relative rotary motion betweenthe driven rotary member 18 and the mechanism carried thereby on the onehand and the connecting member on the other hand. It is likely that theconnecting member will turn in the same direction as the driven rotarymember 13 but at slower speed.

The amplitude of vibration or oscillation of the vibrator rollers can beadjusted without stopping the press. The adjustment is extremely simplerequiring only loosening of the lock nut 45, turning of the collar 43and subsequent tightening of the lock nut 46. Not only can theadjustment be effected without stopping the press but it can be effectedin a very short space of time; further, the mechanism is relativelysimple and reliable and inexpensive and requires a minimum ofmaintenance.

While I have shown and described a present preferred embodiment of theinvention it is to be distinctly understood that the invention is notlimited thereto but may be otherwise variously embodied within the scopeof the following claims.

I claim:

1. An inker comprising a driven rotary member, a crank pin whose axis isparallel to and normally offset from the axis of the driven rotarymember, mounting means including spaced apart parallel arms of equallength pivoted to the driven rotary member and a cross link pivoted tothe ends of the spaced apart parallel arms on which the crank pin ismounted, the spaced apart parallel arms being shiftable to alter thedistance which the axis of the crank pin is offset from the axis of thedriven rotary member, means adjustably positionable generally axially ofthe driven rotary member for thus shifting the spaced apart parallelarms, a vibrator roller, means for rotating the vibrator roller andconnections including a connecting rod between the crank pin and thevibrator roller for axially vibrating the vibrator roller, the greaterthe distance which the axis of the crank pin is otfset from the axis ofthe driven rotary member the greater is the amplitude of vibration ofthe vibrator roller.

2. An inker comprising a driven rotary member, a crank pin whose axis isparallel to and normally offset from the axis of the driven rotarymember, mounting means including spaced apart parallel arms of equallength pivoted to the driven rotary member and a cross link pivoted tothe ends of the spaced apart parallel arms on which the crank pin ismounted, the spaced apart parallel arms being shiftable to alter thedistance which the axis of the crank pin is offset from the axis of thedriven rotary member while maintaining the axis of the crank pinparallel to the axis of the driven rotary member, means for thusshifting the spaced apart parallel arms, a vibrator roller, means forrotating the vibrator roller and connections including a connecting rodbetween the crank pin and the vibrator roller for axially vibrating thevibrator roller, the greater the distance which the axis of the crankpin is offset from the axis of the driven "y m mber the ot the viL atorroller.

3. An 1 her co [sing a driven rotary member, a crank pin whose axis isparallel to and normally offset fro the of the driven rotary membercarried by the rotary member rotatable th rew in ans seoarate g tiredistance which the axis of the crank pin oils from the axis of thedriven rotary member, such resns being constructed and arranged to swingthe crank pin relatively to the driven rotary member so that alterationof the distance which the axis of t e crank pin is ollset from the axisof the driven ro LZll'Y member is accompanied by slight axial movementof the crank pin, a vibrator roller, means for rotating the vibratorroller and connections including a connecting rod with sphericalbearings at both ends etvvcen tne crank pin and the vibrator roller foraxially vibrating the vibrator roller, the greater the distance whichthe axis of the crank pin is oilset om the of the driven rotary memberthe greater is the amplitude of vib ation of tie vibrator roller.

4. An i 21' comprising a driven rotary member, a bell crank lC'v'c'l'pivoted to the driven rotary member about an axis offset from the axisof the driven rotary member and substantially normal to a planecontainin the axis of the driven rotary member, the bell crank leverhating a first arm intersecting the axis of the driven rotary memher anda second arm e nding generally parallel to the axis of the driven rota yii oer, a first link pivoted to the second arm and e ;end1 g generallyat right angles to the axis of the driven rotary member, a second linkpivoted to the first link and to the driven rotary member insuringmaintenance of the first link extending generally at right angles to theaxis of the driven rotary member in all on 'zlive positions of the bellcrank lever, a crank pin carried by the first link whose axis isparallel to and altering at n. angular position of the bell crank leverand thereby ing the distance whicn the axis of the crank pin is on Lfrom the axis of the driven rot ry incinbcr, a vibrator roller, meansfor rotating the vibrator roller and connections including a connectingrod between the crank pin and ti e vibrator roller for axially vibratingthe vibrator roller, the greater the distance which the axis of the or kpin is oilset from the axis of the driven rotary member the is theamplitude of vibration of the vibrator roller.

5. An inker comprising a frame, a bushing stationarily mounted in theframe, a driven rotary member mounted for rotation in the bus..ing, abell crank lever pivoted to the driven roary member about an axis offsetfrom the axis of the drivv member and substantially normal to a planeconti mg the axis of the driven rotary member, the bell er lever havinga first arm intersecting the axis of the o ven rotary member and asecond arm exten ing generally parallel to the axis of the driven rotaryor .bc;', a first link oted to the second arm and ext ng generally atright angles to the axis of the driven rotary member, a second linkpivoted to the first t int from the axis of the driven rotary member, anadjusting collar thrcadedly connected with the bushing so that when thecollar is turned relatively to the bushing the collar moves generallyaxially thereof, means connecting the collar with the first arm of thebell crank lever for turning the bell crank lever to alter the distancewhich the axis of the crank pin is oliset from the axis of the drivenrotary member upon such movement of the collar, a vibrator roller, meansfor rotating the vibrator roller and connections including a connectingrod between the crank pin and the vibrator roller for axially vibratingthe vibrator roller, the greater the distance which the axis of thecrank pin is offset from the axis of the driven rotary member thegreater is the amplitude of vibration of the vibrator roller.

An inker comprising a driven rotary member, a bell crank lever pivotedto the driven rotary member about an axis ofl'set from the of the drivenrotary member and substantially normal to a plane containing the axis ofthe driven rotary member, the bell crank lever having a first armintersecting the axis of the driven rotary membar and a second armextending generally parallel to the axis of the driven rotary member, afirst link pivoted to the second arm and extending generally at rightangles to the axis of the driven rotary member, a second link pivoted tothe first link and to the driven rotary member insuring maintenance ofthe first link extending generally right angles to the axis of thedriven rotary member in all operative positions of the bell crank lever,a crank pin carried by the first link whose axis is parallel to andnormally oilset from the axis of the driven rotary member, means s iratefrom the driven rotary member guided for move nt generally along theaxis of the driven rotary member and having a sliding connection withthe first arm of the bell crank lever for turning the bell crank leverabout its pivotal connection with the driven rotary member and therebyaltering the distance which the axis of the crank pin is offset from theaxis of the driven rotary member, a vibrator roller, means for rotatingthe vibrator roller and connections including a connecting rod betweenthe crank pin and the vibrator roller for axially vibrating the vibratorroller, the greater the distance which the axis of the crank pin isoffset from the axis of the driven rotary member the greater is theamplitude of vibration of the vibrator roller.

References Cited in the file of this patent UNITED STATES PATENTS

1. AN INKER COMPRISING A DRIVEN ROTARY MEMBER, A CRANK PIN WHOSE AXIS ISPARALLEL TO AND NORMALLY OFFSET FROM THE AXIS OF THE DRIVEN ROTARYMEMBER, MOUNTING MEANS INCLUDING SPACED APART PARALLEL ARMS OF EQUALLENGTH PIVOTED TO THE DRIVEN ROTARY MEMBER AND A CROSS LINK PIVOTED TOTHE ENDS OF THE SPACED APART PARALLEL ARMS ON WHICH THE CRANK PIN ISMOUNTED, THE SPACED APART PARALLEL ARMS BEING SHIFTABLE TO ALTER THEDISTANCE WHICH THE AXIS OF THE CRANK PIN IS OFFSET FROM THE AXIS OF THEDRIVEN ROTARY MEMBER, MEANS ADJUSTABLY POSITIONABLE GENERALLY AXIALLY OFTHE DRIVEN ROTARY MEMBER FOR THUS SHIFTING THE SPACED APART PARALLELARMS, A VIBRATOR ROLLER, MEANS FOR ROTATING THE VIBRATOR ROLLER ANDCONNECTIONS INCLUDING A CONNECTING ROD BETWEEN THE CRANK PIN AND THEVIBRATOR ROLLER FOR AXIALLY VIBRATING THE VIBRATOR ROLLER, THE GREATERTHE DISTANCE WHICH THE AXIS OF THE CRANK PIN IS OFFSET FROM THE AXIS OFTHE DRIVEN ROTARY MEMBER THE GREATER IS THE AMPLITUDE OF VIBRATION OFTHE VIBRATOR ROLLER.